Swansea City have failed in their bid to overturn the suspension handed to Ryan Manning this week.
The Republic of Ireland international was shown a straight red card for a foul on Harry Wilson late on in the first-half of Tuesday night's 5-1 defeat to Fulham at the Swansea.com Stadium.
It means the 25-year-old is required to serve a three-game ban, although that was increased by an additional match given that Manning was sent off against Blackburn Rovers earlier on in the season.